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Engine-Codes – GMC – P0873 2016 GMC Sierra

P0873 2016 GMC Sierra Code - Transmission Fluid Pressure Switch 3 Circuit High Voltage

Quick Answer

The P0873 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the Transmission Fluid Pressure Switch 3 Circuit High Voltage. Common causes include Faulty transmission fluid pressure switch, Wiring or connector issues in the transmission fluid pressure switch circuit, Low transmission fluid level or contaminated fluid. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0873 2016 GMC Sierra indicates Transmission Fluid Pressure Switch 3 Circuit High Voltage.
Common causes
Common causes include Faulty transmission fluid pressure switch, Wiring or connector issues in the transmission fluid pressure switch circuit, Low transmission fluid level or contaminated fluid.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
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Code P0873 2016 GMC Sierra Description

The P0873 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the Transmission Fluid Pressure Switch 3 Circuit High Voltage. This code suggests that the transmission fluid pressure switch, specifically switch 3, is detecting a voltage signal that is higher than the specified threshold. This switch is responsible for monitoring and controlling the fluid pressure within the transmission system. When the voltage is too high, it can lead to various issues with the transmission's operation and potentially cause damage if not addressed promptly.

OBDII Code P0873 2016 GMC Sierra - Transmission Fluid Pressure Switch 3 Circuit High Voltage
P0873 2016 GMC Sierra Code - Transmission Fluid Pressure Switch 3 Circuit High Voltage

Common Causes of P0873 2016 GMC Sierra

  1. Faulty transmission fluid pressure switch
  2. Wiring or connector issues in the transmission fluid pressure switch circuit
  3. Low transmission fluid level or contaminated fluid
  4. Mechanical issues within the transmission system
  5. Electrical problems in the transmission control module

Symptoms of P0873 2016 GMC Sierra

  1. Harsh shifting or delayed shifting of gears
  2. Transmission slipping or jerking during acceleration
  3. Illuminated "Check Engine" light on the dashboard
  4. Transmission overheating
  5. Decreased fuel efficiency

How to Fix P0873 2016 GMC Sierra

  1. Begin by conducting a thorough inspection of the transmission fluid pressure switch and its wiring harness.
  2. Test the transmission fluid pressure switch for proper functionality using a multimeter.
  3. Replace the faulty transmission fluid pressure switch if it is found to be defective.
  4. Inspect and repair any damaged wiring or connectors in the circuit.
  5. Clear the DTC from the vehicle's onboard computer system and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0873 2016 GMC Sierra

The cost of repairing a P0873 code on a 2016 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair for this code may range from $200 to $500, including parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can fluctuate, so it's advisable to get a quote from a trusted mechanic before proceeding with the repair.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0873 2016 GMC Sierra Code

1. What does the OBDII code P0873 mean on a 2016 GMC Sierra?

The P0873 code indicates a high voltage issue with the Transmission Fluid Pressure Switch 3 Circuit, which monitors hydraulic pressure in the transmission.

2. What are common symptoms of the P0873 code in a 2016 GMC Sierra?

Symptoms may include harsh or delayed shifting, transmission slipping, the transmission going into limp mode, and the illumination of the check engine light.

3. What causes the P0873 code to appear on a 2016 GMC Sierra?

Common causes include a faulty transmission fluid pressure sensor, damaged wiring or connectors in the circuit, low or dirty transmission fluid, or an internal transmission issue.

4. Can low transmission fluid cause the P0873 code on a GMC Sierra?

Yes, low or degraded transmission fluid can contribute to pressure irregularities, which may trigger this code.

5. How can I diagnose the P0873 code in my 2016 GMC Sierra?

Start by inspecting the wiring and connectors for damage or corrosion, checking the transmission fluid level and condition, and using a scan tool to monitor transmission pressure sensor readings.

6. Is it safe to drive my 2016 GMC Sierra with the P0873 code?

Driving with the P0873 code is not recommended, as it can lead to further transmission damage or unsafe driving conditions due to shifting issues.

7. How do I fix the P0873 code on a 2016 GMC Sierra?

Potential fixes include repairing or replacing damaged wiring or connectors, replacing the transmission fluid pressure sensor, performing a fluid change, or addressing internal transmission problems if necessary.

8. How much does it cost to repair the P0873 code on a GMC Sierra?

Repair costs vary but typically range from $150 to $500, depending on whether the issue is a simple sensor replacement or requires more extensive transmission work.

9. Can a bad transmission control module (TCM) cause the P0873 code?

While less common, a malfunctioning TCM can cause communication issues with the pressure sensor and trigger the P0873 code.

10. Do I need to reprogram my transmission control module after fixing the P0873 code?

Reprogramming is not usually necessary unless the TCM was replaced or updated as part of the repair process. Always consult a certified technician for confirmation.

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